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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '67dfc2dfa57c05d25404f18da2341ccf469a5e29d46a23e6466b93d24f59b549' 
  AND token = 'nZz9FX2cAAGUW/LXCwenREyoodBJNTthObLpY4OykEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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