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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd1720b9ecb96355c1c683da869ec0e4e721f33d3437c289a2ead71a43fd7ae2' 
  AND token = 'r3P/shaEnP/P3aX6Is3m52hpxVPHA1OAgaHdeeGEdrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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