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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6daa9e219cc06b67509e15234d02e1d953c6536eb5ad00d7cdad6fc4ebd992bf' 
  AND token = 'FyrXKoBdplWYRISZTekF9HugallKye33wVdIWEFDLAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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