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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd99c8c5edd4c33dd8f526f6436e9fae3067ed6e6b822fe8f2482422c8537935d' 
  AND token = 'uRkIg7RBtOQmHHN06zOJhNLVNwEx41TS+98tgIm13Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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