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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b2ce576d305b06e60566e1bbdf532aef553e86d57a4e3fa469aaac464fc43f7' 
  AND token = 'bLi70Vy2P7eqVLwb+bRLuvk2T6FPj7eRybaoy1nAT98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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