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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8cb0a7b5c92dc26dd07924a5289e7d7a833f810bda0225e3f0cf7b507d903449' 
  AND token = 'AbGv8p2VIL0LXqqcpZqZbW1bVOrAhn0EO4+ZHw9xuFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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