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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9014de94e56e370faa69e1c6943e701cf959b386d1720b9a1263e4fc3c73b496' 
  AND token = '2356s0/Ws3mjtZZtogtdviTDZhnfHkK29YQECWABuK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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