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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57010cc0aef9ad4db90247b5d09daf6b511bd0a43e0f446d5dbb9f393e31e09e' 
  AND token = 'LsOVysJ0a7+ISBnF75i7FkCiMHTfW5kG2wUqU5PBM/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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