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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bbd3d77c44a12f9538abd0e3ec091e3ba1cd4cb30cce5aa0276959ef214a1d25' 
  AND token = '6aKTaJEYXcl/D/azb37vpbg4a+XRph4f2F3IfwHwTxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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