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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '315c9c75e161bf501bfcf53185af3ba91aafeab95ccbba5fe6a14430077b5ff7' 
  AND token = 'UAadkBx84m5xLzyYiJ842AKziEJ0x9eJtY2DgjqSfj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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