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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0919242064b9a65e686feb5e630d9d678c4dad779e69593bacd21482089115a0' 
  AND token = 'Rg/8bepAbJdUt165QfyTubDSOypAJJUnVn1+XLarcE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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