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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb7ea18d3af894769e1606492fbf17b7ded784321906bc967f91f7809060d68b' 
  AND token = 'nfaddS0tBuTT20k8CRw7lmEGSQPezHGnRhSt1DUGVVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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