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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd991fb8cd1821c3c686a633d43ba00fdc37f1ac6d2fe3b83f3eb77e916d3385a' 
  AND token = '6LV2AJfcl7qlb5lNc8s0t27PuxFj21LI19HEj1tnqQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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