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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '311a80d6747c383ac312ae29336631813ce24f61a95670d5b9e60e32b7358ad5' 
  AND token = 'Ywy5Atpy626ECODq3FgT8mzEs6QxaTHfm+6Ol5syXBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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