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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d048e51fa1e9fffdb36ca0925d61ff194ac9f46bd44033fe49a240599f71c85' 
  AND token = '/iEKH90ddhr6rVofi19UNAql96j/1OZ+jkE8rTaCdRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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