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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '19ce129b4eb4d93da5ddb20c692d0bb6889d0da4ebe4cbc44cb432e4cb9d5f2b' 
  AND token = 'Z+suVSVcu8R0U7fldkPLN5QxnRxjqzaPPv01RDBXGDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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