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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'abe378d2b00eecf89bea482cae5b1130cf2ab47d43e9adecd59ac6ab33cd87b5' 
  AND token = 'oZg9z9oWcM7KE+rKQpKmiBtY/6ZuU4D2ncvS7pVzPd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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