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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '954e4744450969ce8d4274f385cf6272fc3c55e7677d29eb78b263bc9f097802' 
  AND token = 'qaH/vmbME8m9zh6NSx6ctmncGu+VTaRMM0dbsJTNT4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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