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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e3812ac9fb7db7226c445a042fcf8264c8fe470dd0f34380d089943badc68996' 
  AND token = 'LtV0baGtyUnGnbneyM5FLtGbrgGJUBaekrr/5+xg9ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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