Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4870cafc0b5f2e7b2644fb8b668046f08bf344c2e14dd76b1281556242c1c4c' 
  AND token = 'fJm12+aouWrvdTWuNlHCF+ooX/kAP77saqGI+RkyD1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}