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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b79b858fc6c8db61b863906f728dd1cdd80643cff49dcac7911dfe55fe2faa05' 
  AND token = 'dGt/mP0ta2keBkwi3cjok+BDj1GoLIK9L1rCfQKe7+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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