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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f61d4ce6c4992902d0cd3bf34c737ddafd5a228f7bf117e14b6c7065f6511fd3' 
  AND token = '2Z6jr+FHod5YWES3y4hj44rEc2Teq+uN7nGDBcHDxjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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