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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '735911c818db54eb59973286b12eb5b14b76b58044c883b836277845f2bacee0' 
  AND token = 'fHL1VSmE9J+iQJLIQhXeVk5DVZNEeMI5GPmc5eltV4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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