Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b7532b4c306621bc2659254f8680292dbab2ad681daba59a9ec399ab2db78a' 
  AND token = 'VPFuXwIr1mCm1Y+yyp86gmZ7nYi1pU4l7Dz5T/J7SDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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