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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '680a87339459ae0dc717653f30d0f98a8fdd506d698e4b4b1a6774e95a309479' 
  AND token = 'CuHisadK4v4wny/TXujmxRbixCXI54+B394Mt4Lc+bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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