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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'beaa11e3d05931f5aef91aef9046eaa415ba79104445389f4031dc4a782f91d3' 
  AND token = 'oBddcnH0W4QVoeuuwTGjNzQaiisl17hbHT5X9RxdrMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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