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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f325240dac2a2f04c1f716edca7e38e5252fa1d9c7ec14ebe3a8896d024a6751' 
  AND token = 'JYIcpcXzw4IrDulkZrrk8UQjXSep6oRpOQL7kvQoGkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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