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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7172f2392bcfae8c0b96a36aca47eed691fbf8240ae340650f5a6c6b0ee048b6' 
  AND token = 'MyC5e6X98iq/dcgtavj6iN8etfgJ7Rr7JDKI82wam8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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