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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e011c78fc11a8d3f23ae77dcfda8c475b273feecb5e0a50c096327533015eaf' 
  AND token = '/clxjSSQxltxPxYRuG7dBC2VLIOTxAyQVWv9Ccqa5v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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