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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ab6a78b1932fedc8fc6137b9fc6369294a2dce26434d706d1266c00da9f80042' 
  AND token = '3bkGxG5wUdLsMSAC0slc7Z/9YvPz1fLWs66PGILq8/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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