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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a1557b6efa45491f24ba183857ddd9afb768be79a12e56f4377710867943589' 
  AND token = 'jUD3eFA6x7ZD2aoT0n720dQlSOdywsQTK/ILio+/zRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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