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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fb102f3fcb6e8dac392275146ef6f85df750fff16e126ed1d55bdbd7ff22b52c' 
  AND token = 'flqcpYqtafgObeqOS8inovNW9et5krZ0xSVYiCiF8tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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