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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4035f205b029b5bc30a0fa0c48e8bdf1755d0ddb57b25b9d00131a669460b65b' 
  AND token = 'Zos8urhuwx7FoahKb6utVP1XQfNopWtMCBKbd6mdWHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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