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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7da6f650aff01064ded11d7922bd11ffbca27b17e21ae4b01d28645c1ce02ce' 
  AND token = 'cz7SVHUxA9gRtuu2xDaB34H3KO9SoZGSRzjNAT4WC3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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