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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9440279bf8bde51f06a223625bd5ac289f2fc4ec6762c0ba1c18f4cb828015c7' 
  AND token = 'ytbl76EcpSqXRU6889lSJKMCA8mIn9SLgA1jIikvwMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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