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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ea205f44da8e99f04ce752e2b215d6c44e5c601d54af214638772ee45c0f3b56' 
  AND token = 'Dw3Uf7CkNuXgOkhtGgav6XXecNS/13Y7VH0DhUX6yIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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