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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '21a68fa4ac9ea95026c18692cf33cbcf8345ab2da9f353814cf56ec32b1eb054' 
  AND token = '2OcgrNPjU7oPdslOgHwaoktlLtHlwXC9J1mI4/pENS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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