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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a150f1ce358f3b24c761c9ded8d24107c31bc2c744204078ca3b2ed160c57834' 
  AND token = 'AAFvxS3Pj2ksiN5cXoGasHvepx46VgBgbHrUubDLbsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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