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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3c5991f7da1d41c77265fd30a95a7e24c9d9534e20ebc42c006d8ba115e8a3a3' 
  AND token = 'TZVeTVA0yLzXreAsI5PjyiIrGpSUdsibqcGm+GrSbOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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