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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7decf494cf09f5ccd8285941fb9c55282dc3e8f9f090c408277f83996e3ce17' 
  AND token = 'E5Wq5isXvUlC22eLFcVFb31faiWbf/vl2/6Wh6eMgHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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