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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e5d295a848d3384eb5cf956babb64f583b03559ef09b3fe0fac263583d60854' 
  AND token = 'OXJdvU/oW5lY7X/bJEZhDIexTXv4WsK77O3WMf7aIb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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