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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'df4fbb133dc54458fdd4cac5e3e4cdf0950ff7db628e288a219ad297fe70b2f9' 
  AND token = 'oweTnT4AsbaY43JQSA7yW4QuCTa7aA/YcXc/Owt9L3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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