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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c04250936ada45157ee2bbe5ff843b575b38016f4479fd073b8f4808dcfa700f' 
  AND token = '+zf2oCXQdLj7zudIiecisAeNqNHliEnC7+hFoXCQK80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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