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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0dd5a5ebcbbed10cac84f4ff71a889c9a93324163816005ac80f465cbc9da35f' 
  AND token = 'BehAAlRAyUMktT5tItyrPRpxBPbzYm3hXemAxMnSTHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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