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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0fac3c7929e02bf283678fba243f10d9d10e005741b03452c922f2ca9c77a587' 
  AND token = 'KOrK5HC+GozOLoWwwea7Ok/uJm4y/TooEbj8e1b81Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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