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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ba7fdf386199236c4d868356a8d5bffba88e47661324f6d2b4ea7eba117c6d2' 
  AND token = 'nIensszXeOQFeUtfefJfjEHAa5WVGDk1i3rz4OhGkaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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