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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aaf675a58e9908eb6e2e05db6b66447aaa64fecf536336ca9c0e00c603fb0545' 
  AND token = 'vMUvY567oKsdTqlYn/FuuaXmcZKEHcq/Y0u0Xn1OhlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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