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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0cd89a04a5d258083f5960bf3c315a67a120cd1a305a66bbbbaf1ef3bf1ccea8' 
  AND token = 'uKUPSj14u2siCOSR00FgRTvS2SOxa+kPPwGFvHQsYLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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