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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2fadddf99da551e7dafc6b86626c666b79f516d3530360416b56f9700888aa0d' 
  AND token = 'ckMVaUeKyZfms1I2GHleca2X3aq6T94aMO7BwipS9d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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