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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '96e68424438e5d54b8c7e263c4f32c5a2bd90da3c39b5c7a458ff83521eab4e3' 
  AND token = 'IuGuh/Kx4khDXiWzKosFUNEWSRexfrHTXeKy5rSD1Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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