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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab8f031f2bdce9959d6c5fd1755698db81cee1f268a587bcc5df82c8cf11783a' 
  AND token = 'uqjdHS/WtsX1tQciNYqUEYPGldIUyvUe0RG/o2Df8xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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