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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '605b1f1e41d3d4508593deba5cead4c68ffaf7117c770137d58de58322d249d2' 
  AND token = 'XVdf0jrL1UsFuAzIR+9YxX5UDN6sFCksm+e0loVYHJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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