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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '55278dba18a93eab6cd4d4b8b3bd6f9854817191e88de84363dbef01a7821587' 
  AND token = 'zNBldhVeh9Nb6x2gQ58yqa5wmCGR1jvG6S71cklm0/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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