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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d0f67d9f356c050de49df3b750509aa7dbca772560ffcc6bcc0de2c9949095f' 
  AND token = 'MJu3V9C1SSIDw1b3AL1r4NS3eb7bb825YH31WfON7bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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