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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eddecc9002ce99004cccb7de2ba1ec22e46df4a7fc6a5202700e366de8981ecf' 
  AND token = '+iInFUEFqihRCwmg6JbThXNhIOiZHGc0RcMLo/J4HtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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