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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '659d1036215a4e0f7ceec7192805687e7ecfca0d68e4552518d3c64e162403e3' 
  AND token = 'dmDOYzp7d1bTSmkjYJOl9cJyN0fJ+u0WPMsw4JPYUTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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