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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '13fb232abb77c80d0229ab452cc162f66def77a3eab3c3afdab257cc0b4fc6c3' 
  AND token = 'BQY1SMqnqHnzgdllumqRcce6Hfi5YInDRpoYzjV12jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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