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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f01e8b6621ccd5d718bf083b442365a8edf60bc7e12bfacd182f2c6120ab0d61' 
  AND token = 'v465D64l2fJrJ/d2Kk7LwhpmXe8mYtxRaByR8WL/+xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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