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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c80798c3e6d2817c84257fb31475e42c15be071a36ed0553d019c741efd09337' 
  AND token = 'knJpn+Xc9qVVAuQ1Cc6Wd3sKxktnxbz2XJ3KHWkisao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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