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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b5125113fdc89237289232f5e91fb6a6d3df38966ee015268891ba8ae93f84a8' 
  AND token = '524o1j6TDt9sTbmoDn4VDIxL+o/Xw2J9QU3kUNG9vfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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