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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4e92313635ec7cc1a86d09abbee43d2867c23bc2e317eeba65471c35db1e8f8b' 
  AND token = 'IIiNmvvFXkSVvn8JaAuwVu5pNcyFnUuIsEGxJMl6QUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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