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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f8075479ed712c5f94d19ae85cf5b9ee32652d9d5ca432561f6b37615ceca670' 
  AND token = 'sq44oPC68kQ/7KLS3SnlLfK7DNZkoW2gqkevS5eB8v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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