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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3064473cf48b8eedc06d1b6bbf9db03556a2ee93043af7bc519cc61b1ef8dc73' 
  AND token = 'yG767FzyDFIyRodpQ9rzT7D6wHee14dEhRp7UPpwV+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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