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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4905272f705c409f729bbfe2f4def733d6381f0d5d3a673922c4e6cec16f503a' 
  AND token = 'S01kvQpfPyXX7v/3728pwpw6VP6Hvc3s27ElELCF2WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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