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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'faff0b8fc7e6c9cb4b3def2492ef4d13cba8170eb1b081a6c541b247c0cbe0e4' 
  AND token = 'EvetDtnWDd00UxiwsjYs6Gt0y7lnYJqseNNX1d3R8Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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