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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '93cf21812d939afe825792e6da4963fd85cd54e310f659703a4ae2b9bd0c42a1' 
  AND token = 'HSvtxNPsc+OAHqT5LZxn2AFJrR11T/yT2KK73avJjlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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