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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ba2303b5ddcae6414afaa8cb14ddc1f22ed6b7b71805bb90d8195aaaf68b909' 
  AND token = 'rMJSUl3YNNTKn2s4bmjU/mnT6Fte/EMnPyb+U84Q8yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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