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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9148803580b8f29ff410bf102c61264e6058a07e521b095031ab49edae6b2113' 
  AND token = 'wx8XW7XlLV6nunUds6rBhdupv47nl8oWsFsnZPiwaPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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