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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5cc65223c5226425fda085b00025747249e83f802676be83596d6ce303f813a4' 
  AND token = 'P85/79f3GMWyr5NcJe+Dvmx/z9FKI4+x2SftKSVRJco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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