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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cab6ff5192b1100029e16922a34fb91ae49a825dba051d304b75fc4d19eafc20' 
  AND token = '2CQKr4/skVr0+1N8ySGhHpFGiZH1RSZfV6WWNQAq6RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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