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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '63a9e9f6c3a0c62df0dd1889d561a547228b5d4f55398e95e43a6e1df927d1ed' 
  AND token = 'eIVsm11piTYU3ryJBXGnv/7lC7faf7iis5nL8WWY3OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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