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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '48dc3c377fa65966f78717b0823652cc9e482b429e536f6a6d1d1013f951c01b' 
  AND token = 'tAztI7kxdHmISqUCQTyMlOpq0fcyWCSIKsVlldA2EXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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