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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9a36f178d5760927fa7aea60f7f7c229947e92374e541ad18a2539e932c3d565' 
  AND token = 'PdQudye1Vt94kpNTkBHQA36wblzqQlC/JacGI8EpnVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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