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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da55ace8d157f4d8af5922e01ea09e67bca16ec5fb620cfe70ba9188c24a02a3' 
  AND token = '9MytF6i+H+W/tEbqweTgZ76yKHLZibFwlBL+JYhH1/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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