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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '81aa13e65ebe7ab7ac2f3300a37187787e44411a22c3f27e95ba792e2cf4554c' 
  AND token = 'x61Ahq2jYSzV7NalubPuKJ28cVgido4mEgcz0YuvQ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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