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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7590ef9383f10fba0ba5e250199261bb6e4f54f29ded75ec163e6261fbb0e13d' 
  AND token = 'DWRQIB9cFi3TlF1zyOoHxJ2/ZIC36r9sbgUAiMzL9A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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